Perhaps you should try some spelling variations:
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"50 ms decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 mg decrease" (Expand Search), "50 mm decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search)

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You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("5 ng decrease") OR ((("50 a decrease") OR ("50 ms decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"5 ng decrease\") OR (((\"50 a decrease\") OR (\"50 ms decrease\"))))".
• Removing quotes may allow a broader search: (( 5 ng decrease ) OR ((( 50 a decrease ) OR ( 50 ms decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("5 ng decrease") OR ((("50 a decrease") OR ("50 ms decrease"))))*.